I can't remember *not* being allowed wine with a meal, albeit so heavily watered that it barely coloured the glass. Beer came much later. (Actually, only after legal drinking age in the company of my parents, though a littleconsiderably earlier in pubs.)
I think my parents were, though, a little nonplussed when we stayed with an old friend of my parents whose new husband was a gentleman of the old school. He had opened something quite fine to have with our meal - 25 year old claret or something similar - and quite naturally poured me a glass, albeit a small one. He was taken aback when my parents said I would have it watered down, though eventually conceded that I could have a glass of water to accompany it.
I was six.
I don't think I enjoyed it, really - in retrospect, it was the idea of drinking 'wine,' just like the grownups, that I liked.
(And, obvioushly, it'sh never done me any harm. Hic.)